Some of the oldest rocks on Earth can be found amid the spiky grass and orange-red dust of Northwestern Australia. While most rocks have been altered over time through geological processes, the Australian rocks have remained relatively unchanged since their inception 3.47 billion years ago. Earlier this year, Yanan Shen of Harvard University, Donald Canfield of Odense University in Denmark, and Roger Buick of the University of Washington announced they found evidence for life in the ancient Australian rocks.